使用 Eclipse 将 Scala 项目导出到 .jar 后，应用程序以java -jar app.jardies with error开始java.lang.ClassNotFoundException: scala.Predef$。
完整输出：
Exception in Application start method
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:490)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:829)
at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:150)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NoClassDefFoundError: scala/Predef$
at main.App$.debug(App.scala:69)
at main.App.start(App.scala:23)
at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:772)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:260)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:223)
at com.sun.javafx.application.PlatformImpl$5$1.run(PlatformImpl.java:220)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:220)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:94)
Caused by: java.lang.ClassNotFoundException: scala.Predef$
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:354)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:353)
at java.lang.ClassLoader.loadClass(ClassLoader.java:422)
at java.lang.ClassLoader.loadClass(ClassLoader.java:355)
... 9 more
参考线at main.App$.debug(App.scala:69)：
object App {
//...
def debug(s: String) {
println("DEB: "+s)
}
// ...
}
这似乎是因为 Scala 库不包含在 jar 中。我该如何解决？
我已经阅读了有关使用 maven 插件的解决方案，但我更喜欢手动选项。